| http://www.w3.org/ns/prov#value | - Covers the Vertical Line Test, along with how to know if a formula is a function even without the graph. ??? ???Functions versus Relations???, Do not confuse SQL functions with user functions written in PL/SQL. If you call a SQL function with an argument of a datatype other than the datatype expected by the SQL function, Oracle implicitly converts the argument to the expected datatype before perfo
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